What is JIS K 6911 and what is JIS K 6253, there are documents to append the score.

Japanese Industrial Standards. I don't know what it is.

Japanese Industrial Standards (JIS) are the most important and authoritative standards in Japan. It was established by the Japan Industrial Standards Survey (JISC).

Classification It is divided into 19 items: civil engineering and construction, general machinery, electronic instruments and electrical machinery, automobiles, railways, ships, iron and steel, non-ferrous metals, chemicals, fibers, mining, pulp and paper, management systems, ceramics, daily necessities, medical safety equipment, aviation, information technology, and others. As of February 7, 2007, there were 10,124 JIS standards in force.

In other Japanese, jis is transliterated as , which was developed and reviewed by the Japan Industrial Standards Survey (JISC), and is one of the most important and authoritative standards in Japan. According to the provisions of the Industrial Standardization Act of Japan, in addition to formulating special standards or technical specifications for medicines, pesticides, chemical fertilizers, silk, food, and other agricultural and forestry products, JIS standards also involve various industrial fields. Its contents include:

Product standards (product shape, size, quality, performance, etc.), method standards (test, analysis, testing and measurement methods and operation standards, etc.), basic standards (terms, symbols, units, priorities, etc.). Majors include: construction, machinery, electrical, metallurgy, transportation, chemical industry, mining, textile, papermaking, medical equipment, ceramics and daily necessities, information technology, etc.

Since 1990, the total number of JIS standards has remained at around 8,200. Among them: about 4,000 product standards, 1,600 method standards, and 2,800 basic standards.

As of the end of March 2006, there were 9,728 JIS standards in force.

The corresponding in this paragraph** JIS: a - civil engineering and construction; b- General machinery; c. Electrical and Electronics; d-Automotive; e-Railways; f-Ships; g-Steel; h-Non-ferrous metals; K-Chemistry; L-fiber; m-Mine; p-Pulp, paper; Q-Management System; r-furnace industry; s-daily necessities; T-Medical Safety Equipment; w-aviation; x-Information processing; z- Other.

A represents the diameter of 10mm, 20a 25a 50a 65a 80a inner diameter is 20mm, 25mm, 50mm, 65mm, 80mm.

Flange, also known as flange disc or flange. A flange is a part that connects between pipes and pipes, and is used for the connection between pipe ends; There are also flanges used on the inlet and outlet of the equipment, which are used for the connection between two equipment, such as the reducer flange. Flange connection or flange joint refers to the piece composed of flange and pad.

and bolts are connected to each other as a set of combination seals which bundle structure of detachable connections. Pipe flange refers to the flange used for piping in piping installation, and used in equipment refers to the inlet and outlet flange of equipment. There are holes in the flanges, and the bolts make the two flanges close together.

The flanges are sealed with gaskets. Flange sub-threaded connection.

Threaded connection) flanges, welded flanges and clip flanges. The flanges are used in pairs, and the wire flange can be used for low-pressure pipes, and the welded flange is used for pressures above four kilograms. A gasket is added between the two flanges and then bolted.

The flange thickness of different pressure cavities is different, and the bolts they use are also different. When the pump and valve are connected to the pipeline, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections. All the connecting parts that are bolted around the periphery of the two planes and closed at the same time are generally called "flanges", such as the connection of ventilation ducts, this kind of parts can be called "flange parts".

However, this connection is only a part of the equipment, such as the connection between the flange and the pump, so it is not good to call the pump "flange parts". Relatively small ones, such as valves, can be called "flange parts".

The grinding bird diameter of the A generation difference table is 10mm, 20a 25a 50a 65a 80a inner warp is 20mm, 25mm, 50mm, 65mm, 80mm respectively

JIS is the Japanese national industrial standard, ISO is the international standard;

1. B5 (JIS) printing paper:

The size is 182mmx257mm (in.).printer paper;

2. B5 (ISO) printing paper::

The size is 176mm x 250mm (in.) x in.printer paper;

JIS is the Japanese national industrial standard, ISO is the international standard, the size of the two standards of paper at the time of production is different, A0 paper is 840 1189, B1 paper is 707 1000

B5 is 176 250

JIT (just in time) is simply a special kind of JIT timely supply of DU goods.

zhi and extreme state.

The basic idea of daojit can be returned.

It can be summarized as: to respond when needed, to produce and provide the required products according to the required quantity, that is, through the management of inventory, to achieve no inventory or the smallest amount of inventory, for which a series of specific methods including "Kanban" have emerged. Compared to JIT, JIS can be said to have taken inventory requirements to the extreme.

Generally speaking, what parts the vehicle manufacturer wants, the first business will send what parts, of course, the actual delivery is according to a certain frequency of delivery. Usually, these parts are of high value and large volume, and the automaker has certain requirements for its shelf life, so the automaker generally does not store inventory. To this end, some first-class manufacturers do not hesitate to set up a certain inventory of finished products to meet the requirements of the vehicle factory, that is, to adopt the model of "mass production, sequential supply", which alleviates the "embarrassment" of the first-class business to a certain extent, but accumulates high waste and risk.

JIT (just in time) is one of the self-pacifying and JIT in engineering design based on the TPS concept, namely: just-in-time JIS I don't know, the above answer downstairs is just a personal understanding Go to the logistics salon logclub**View answer details

jis g3539-1991

Chinese name: carbon steel wire for cold heading.

English Name:Version:Standard Status:

Abolish the Chinese Standard Classification.

cns)：h49 】

International Standard Classification.

ics): Release date:

Date of implementation: Date of repeal:

Pages:Scope of application:

JIS fine Korea, not expensive dozens of dollars.